Find a part by its index

local FolderWithInstances=-- your folder
local Sorted={}
for i, v in pairs(FolderWithInstances:GetChildren()) do 
	local position=string.sub(v.Name,#v.Name,#v.Name)
	position=tonumber(position)
	Sorted[position]=v
end
for i=1, #Sorted do 
	local Object=Sorted[i]
	-- this object is your camera in correct order
	print(Object.Name)
end

I tested it out, and it seems to work.
give it a try